Add no_std support in module, simplejit, and umbrella.

lib/codegen/Cargo.toml

@@ -12,12 +12,12 @@ build = "build.rs"
 
 [dependencies]
 cretonne-entity = { path = "../entity", version = "0.5.1", default-features = false }
+failure = { version = "0.1.1", default-features = false, features = ["derive"] }
+failure_derive = { version = "0.1.1", default-features = false }
 # It is a goal of the cretonne-codegen crate to have minimal external dependencies.
 # Please don't add any unless they are essential to the task of creating binary
 # machine code. Integration tests that need external dependencies can be
 # accomodated in `tests`.
-failure = { version = "0.1.1", default-features = false, features = ["derive"] }
-failure_derive = { version = "0.1.1", default-features = false }
 
 [dependencies.hashmap_core]
 version = "0.1.1"
@@ -28,7 +28,7 @@ optional = true
 # of some minimal std-like replacement libraries. At least one of these two
 # features to be enabled.
 default = ["std"]
-std = []
+std = ["cretonne-entity/std"]
 core = ["hashmap_core"]
 
 [badges]

lib/codegen/src/context.rs

@@ -23,6 +23,7 @@ use preopt::do_preopt;
 use regalloc;
 use result::{CtonError, CtonResult};
 use settings::{FlagsOrIsa, OptLevel};
+use std::vec::Vec;
 use simple_gvn::do_simple_gvn;
 use timing;
 use unreachable_code::eliminate_unreachable_code;